17 Questions
What can cause artifacts in CR imaging plates?
Physical damage like cracks, scuffs, and scratches
How can DR artifacts like dead detector elements be addressed?
Applying software correction
What is the function of a frame grabber in digital imaging systems?
Converts analog signals to digital signals
What does CTDI stand for in radiography?
Computed Tomography Dose Index
In fluoroscopy, what does 'Last Image Hold' refer to?
Displaying the last image captured before radiation is turned off
What is the purpose of Analog-to-Digital Conversion (ADC) in digital radiography?
To assign a digital value representing X-ray exposure at each point on the detector.
What process do Flat Panel Detectors (FPDs) utilize to convert X-rays into digital signals?
Conversion of charges into digital signals using TFTs.
How do Direct FPDs achieve high spatial resolution in digital radiography?
By converting charges into digital signals using TFTs.
What is the main advantage of Digital Radiography (DR) over traditional film-based radiography?
Immediate availability of images without the need for processing.
Which component is responsible for generating electron-hole pairs when X-rays strike in Direct FPDs?
Photoconductive material in the detectors.
What happens during Image Processing in digital radiography?
Corrections are made to improve contrast and sharpness.
What is the main difference between CR and DR in terms of image formation?
CR uses laser scanning to read intensity data from PMT's, while DR reads raw data directly from a TFT array.
What is the purpose of image segmentation in digital radiography?
To establish the location of the collimated border of the image based on the body part and projection.
What is the significance of a look-up table (LUT) in digital radiography?
It is used to display the image with proper density and contrast after post-processing.
In what way does CR differ from DR regarding the need for post-processing?
CR requires immediate post-processing to create a readable diagnostic image, while DR does not.
How does film/screen radiography differ from CR/DR in terms of latitude?
Film/screen radiography lacks latitude as it dictates proper radiation exposure, unlike CR/DR which involve post-processing.
Why is histogram analysis important in digital radiography?
To graphically show how much of the image is exposed at various levels to aid in tone scaling post-processing.
Learn about the different types of DR receptors in Digital Radiography, such as Thin-Film Transistor Array (TFT) and the process of obtaining digital raw images. Understand the characteristics and processing involved in creating diagnostic images from DR receptors.
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